Convert a String of Hex into ASCII in Java

Question

I hope this isn t too much of a stupid question  I have looked on 5 different pages of Google results but haven t been able to find anything on this   What I need to do is convert a string that contains all Hex characters into ASCII for example   String fileName     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   Every way I have seen makes it seems like you have to put it into an array first  Is there no way to loop through each two and convert them

User · Answer

Check out Convert a string representation of a hex dump to a byte array using Java   Disregarding encoding  etc  you can do new String  hexStringToByteArray  75546

User · Answer

To this case  I have a hexadecimal data format into an int array and I want to convert them on String   int   encodeHex   new int     0x48  0x65  0x6c  0x6c  0x6f       Hello encode for  int i   0  i  lt  encodeHex length  i         System out print  char   encodeHex i

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Just use a for loop to go through each couple of characters in the string  convert them to a character and then whack the character on the end of a string builder   String hex    75546f7272656e745c436f6d706c657465645c6e667375635f6f73745f62795f6d757374616e675c50656e64756c756d2d392c303030204d696c65732e6d7033006d7033006d7033004472756d202620426173730050656e64756c756d00496e2053696c69636f00496e2053696c69636f2a3b2a0050656e64756c756d0050656e64756c756d496e2053696c69636f303038004472756d2026204261737350656e64756c756d496e2053696c69636f30303800392c303030204d696c6573203c4d757374616e673e50656e64756c756d496e2053696c69636f3030380050656e64756c756d50656e64756c756d496e2053696c69636f303038004d50330000   StringBuilder output   new StringBuilder    for  int i   0  i  lt  hex length    i  2        String str   hex substring i  i 2       output append  char Integer parseInt str  16      System out println output     Or  Java 8   if you re feeling particularly uncouth  use the infamous  fixed width string split  hack to enable you to do a one-liner with streams instead   System out println Arrays          stream hex split     lt    G         https   stackoverflow com questions 2297347 splitting-a-string-at-every-n-th-character          map s - gt  Character toString  char Integer parseInt s  16             collect Collectors joining        Either way  this gives a few lines starting with the following      uTorrent Completed nfsuc ost by mustang Pendulum-9 000 Miles mp3   Hmmm     -

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String hexToAscii String s      int n   s length      StringBuilder sb   new StringBuilder n   2     for  int i   0  i  lt  n  i    2        char a   s charAt i       char b   s charAt i   1       sb append  char    hexToInt a   lt  lt  4    hexToInt b           return sb toString       private static int hexToInt char ch      if   a   lt   ch  amp  amp  ch  lt    f     return ch -  a    10      if   A   lt   ch  amp  amp  ch  lt    F     return ch -  A    10      if   0   lt   ch  amp  amp  ch  lt    9     return ch -  0       throw new IllegalArgumentException String valueOf ch

User · Answer

Easiest way to do it with javax xml bind DatatypeConverter        String hex    75546f7272656e745c436f6d706c657465645c6e667375635f6f73745f62795f6d757374616e675c50656e64756c756d2d392c303030204d696c65732e6d7033006d7033006d7033004472756d202620426173730050656e64756c756d00496e2053696c69636f00496e2053696c69636f2a3b2a0050656e64756c756d0050656e64756c756d496e2053696c69636f303038004472756d2026204261737350656e64756c756d496e2053696c69636f30303800392c303030204d696c6573203c4d757374616e673e50656e64756c756d496e2053696c69636f3030380050656e64756c756d50656e64756c756d496e2053696c69636f303038004d50330000       byte   s   DatatypeConverter parseHexBinary hex       System out println new String s

User · Answer

So as I understand it  you need to pull out successive pairs of hex digits  then decode that 2-digit hex number and take the corresponding char   String s          StringBuilder sb   new StringBuilder s length     2   for  int i   0  i  lt  s length    i  2        String hex        s charAt i    s charAt i 1       int ival   Integer parseInt hex  16       sb append  char  ival     String string   sb toString

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HEX to ASCII                        public String convertHexToString String hex     String ascii      String str       Convert hex string to  even  length  int rmd length   length hex length     rmd  length   2   if rmd  1   hex    0  hex        split into two characters   for  int i 0  i lt hex length  -1  i  2             split the hex into pairs       String pair   hex substring i   i   2            convert hex to decimal       int dec   Integer parseInt pair  16         str CheckCode dec         ascii ascii     str        return ascii     public String CheckCode int dec     String str               convert the decimal to character         str   Character toString  char  dec          if dec lt 32    dec gt 126  amp  amp  dec lt 161               str  n a       return str

[java] Convert a String of Hex into ASCII in Java

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